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轮机英语测试卷

1 disposal of all kinds of garbage ______but is prohibited within special areas.

A plastics

B commuinuted or ground papers,rags,glass,metal .

C food waste comminuted or ground

D incinerator

2 when anaerobic bacteria convert the sewage to an inert sludge, ____

A no oxygen is needed

B oxygen is necessary

C oxygen is given off

D no gas is produced

3 The internal part of the boiler, if found_____, has to be chemically washed by yard.

A. deformed

B. rusted

C. cracked

D. scaled

4 The internal part of boiler should be welded by yard if found_____.

A. scaled

B. cracked

C. shape changed

D. deformed

5 The tube in a boiler should be blinded if found_____.

A. scaled

B. informed

C. leaky

D. deformed

6 In a_____ boiler the water flows through the inside of the tubes while the hot gases pass around the outside.

A. water-tube

B. fire-tube

C. exhaust gas

D. none of the above

7 _____ are mounted in pairs to protect the boiler against overpressure.

A. Safety valves

B. Water tubes

C. Steam stop valves

D. Blow down valves

8 The furnace of a oil fired boiler should be_____ before the operating burner is lit.

A. filled with water

B. purged

C. cleared of air

D. None of the above is true.

9 When steam is being raised on a boiler, the water level will normally_____.

A. drop as the boiler warms up

B. rise as the boiler warms up

C. remain unchanged until the boiler is hot enough

D. rise and fall with the steam demand

10 The donkey boiler may be given a bottom blow_____.

A. to raise water level

B. only while making steam

C. to remove scum

D. when fire are secured

11. Engine ____ refers to the relative time of crank, at which each operation during the cycle is

commenced and is completed.

A. timing

B. deviation

C. firing order

D. phase

12. In a four-stroke engine the camshaft rotates at ____.

A. half the engine speed

B. twice the engine speed

C. the engine speed

D. four times the engine speed

13. In an ordinary four-stroke engine the exhaust valve open ____.

A. after TDC

B. before TDC

C. after BDC

D. before BDC

14. On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it

delivers power to the crankshaft through the ____.

A. thrust block

B. sounding rod

C. connecting rod

D. push rod

15. The fresh air coming in through the inner air ports, is compressed by ____ to a higher pressure.

A. the cylinder head

B. the cross head

C. the moving piston

D. the stationary piston

16. The main factor determining the output of each cylinder is the cylinder ____.

A. density

B. bore

C. weight

D. material

17. The ports are drilled in the liners at an angle of approx. 20°the result being that ____ is given a

rotary movement.

A. the scavenge air

B. the exhaust gas

C. the mixed air

D. the spray oil

18. The term ____ refers to one complete sequence of operations required to produce power in an

engine.

A. diesel engine

B. stroke

C. cycle

D. compression ratio

19. Two-stroke engines invariably have ____ to admit air when uncovered by the discending piston.

A. inlet ports

B. outlet ports

C. inlet valves

D. exhaust valve

20. While engine is in operation the piston moves up and down, thus causing the rotation of the ____.

A. crankcase

B. slipper

C. cam housing

D. crankshaft

21. Fuel oil begins injection into the cylinder of a four-stroke cycle diesel engine during the ____.

A. intake stroke

B. exhaust stroke

C. power stroke

D. compression stroke

22. In a two-stroke cycle engine, the process of scavenging begins as the ____.

A. piston nears and passes TDC

B. later part of the down stroke part

C. piston passes BDC

D. early part of the down stroke part

23. The rotary motion of a diesel engine crankshaft is obtained from the up and down motions of the

piston via the ____.

A. camshaft

B. reduction gear

C. rocker arm

D. connecting or piston rod

24. Successful combustion inside the cylinders of a diesel engine is dependent upon ____.

A. fine atomization

B. high temperature

C. good mixing of fuel and air

D. all of the above

25. Poor combustion in a diesel engine can be caused by ____.

A. high compression pressure

B. low intake air temperature

C. low exhaust pressure

D. high scavenge air pressure

26. Why is it necessary to compress the air charge in the cylinders of a diesel engine?

A. To ignite the fuel

B. To insure pumping losses are held to a minimum

C. To increase fuel fuel consumption

D. To keep exhaust temperature low

27. Which of the two events listed occurs simultaneously in a two-stroke cycle diesel engine?

A. exhaust and scavenging

B. scavenging and compression

C. ignition and expansion

D. exhaust and compression

28. The thermal energe produced by an internal combustion engine is transformed into ____.

A. combustion energe

B. internal energe

C. external energe

D. mechenical energe

29. The highest pressure in a diesel engine cylinder normally occurs ____.

A. at TDC

B. before TDC

C. after TDC

D. during air starting

30. The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a

____.

A. crosshead

B. crown

C. piston rod

D. connecting rod

31. The four-stroke cycle is so called because it takes ____ to complete the processes needed to

convert the energe in the fuel into work.

A. two strokes of the piston

B. four strokes of the piston

C. one revolution of the crankshaft

D. two revolutions of the crankshaft

32. It is during ____ that work energe is being put into the engine; during the other 3 strokes of the

piston, the engine is having to do the work.

A. the suction stroke

B. the compression stroke

C. the expansion stroke

D. the exhaust stroke

33. In a single acting, two-stroke cycle diesel engine, the power impulse in an individual cylinder

occurs ____.

A. once every crankshaft revolution

B. once every two crankshaft revolutions

C. once every piston stroke

D. twice every piton stroke

34. In a diesel engine, exhaust valves open before the intake ports are uncovered to ____.

Ⅰ. Reduce pumping losses Ⅱ. Reduce back pressure

A. Ⅰ only

B. Ⅱ only

C. bothⅠandⅡ

D. neitherⅠnor Ⅱ

35. The cubic inch displacement of a cylinder is determined by the diameter of the piston and the

____.

A. length of the crankshaft

B. volume of the clearance space

C. weight of piston

D. length of the stroke

36. A piston is at bottom dead center when it is ____.

A. opening the exhaust ports

B. closing the fuel ports

C. farthest from the cylinder head

D. nearest the cylinder head

37. On a large diesel engine installation, cranshaft axial alignment is maintained by the ____.

A. piston rod guides

B. engine thrust bearing

C. crosshead bearing

D. main shaft flexible coupling

38. Valve in the cylinder head of a diesel engine are opened by the direct action of the ____.

A. exhaust pressure

B. valve spring pressure

C. rock arm movement

D. wrist pin movement

40. In a diesel engine, ____ offers the heat energe directly; ____ works as working medium and

changes the heat energe to mechanical energe.

A. the burning of the fuel; medium shaft

B. fuel spray; fresh air

C. fuel; fuel spray

D. the burning of the fuel; the burned gas mixture

41. ____ of the A-frames there is a strong cast iron frame called the scavenging air box.

A. At the top

B. At the bottom

C. In the top

D. In the bottom

42. Although the crankshafts of medium diesel engines appear to be robust, they rely on the support

of ____ to develop their full strength.

A. the piston rods

B. the crank throws

C. the thrust bearing

D. the main bearings

43. Among the rings of a piston the ____ one is subjected to the greatest load and temperature.

A. bottom

B. middle

C. top

D. none of the above

44. Before replacing o piston you should check the rings to see that all clearances and gaps are within

the permissible____.

A. deflection

B. discrepancy

C. error

D. tolerance

45. Each cylinder has one starting valve which is usually opened by air pressure and closed by____.

A. nults and bolts

B. new joints

C. spring force

D. sealing rings

46. In each cylinder cover is a large central openning for mounting ____.

A. the indicating cock

B. the starting valve

C. air inlet valve

D. the exhaust valve

47. In two-stroke engine the crankshaft is connected with ____ by means of the connecting rod.

A. the stuffing box

B. the piton

C. the cross-head

D. guide plate

48. Shims of different thickness are inserted between the shells to enable adjustment of ____.

A. the bearing clearance

B. the bearing thickness

C. the bearing strength

D. the bridge hardeness

49. The chain transmission, forming the connecting between the crankshaft and the camshaft, is

enclosed in in a cast iron casing known as ____.

A. the chain drive casing

B. the strong cast iron frame

C. the scavenging air box

D. the fabricated casing

50. The crankpin journal is provided with large bore for ____.

A. lubrication

B. cooling

C. balancing purpose

D. ventilation

51 To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the_____.

A. shaft and impeller

B. motor and pump shaft

C. casing and impeller wearing rings

D. lantern ring and impeller

52 Why are removable sleeves installed on centrifugal pump shafts?

A. They make it easier to replace the pump shaft packing.

B. They can be economically replaced as they wear out.

C. They can be removed when it is necessary to lighten the weight of the pump.

D. They increase the strength of the shaft.

53 A centrifugal pump may fail to deliver water when first started if the_____.

A. water seal pipe is plugged

B. pump is not primed

C. seal ring is improperly located

D. impeller is flooded

54 If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the_____.

A. packing gland

B. mechanical seals

C. lantern rings

D. wearing rings

55 To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with_____.

A. lantern rings

B. bearings

C. casing volutes

D. wearing rings

56 The valve best suited for throttling gas or liquid flow in a pipeline is the_____.

A. gate valve

B. globe valve

C. check valve

D. plug cock

57 The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the_____.

A. electric motor

B. volute

C. impeller

D. diffusion nozzle

58 One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the_____.

A. motor overload will open

B. relief valve will open

C. pump will overheat

D. motor will overheat

59 A centrifugal pump produces flow with a resulting discharge head by energy conversion. It is typical for the energy conversion to follow the order of_____.

A. mechanical energy to kinetic energy to potential energy

B. mechanical energy to potential energy to kinetic energy

C. potential energy to mechanical energy to kinetic energy

D. kinetic energy to mechanical energy to potential energy

60 The discharge rate or capacity of a centrifugal pump will vary directly as the_____.

A. change in the impeller diameter

B. square of the impeller radius

C. cube of the impeller diameter

D. impeller efficiency for large changes in its size

61 When operating with a negative suction head, which of the following types of pumps will require priming?

A. Reciprocating

B. Centrifugal

C. Rotary

D. Gear

62 The discharge head of a centrifugal pump will vary directly with the_____.

A. change in impeller diameter

B. square of the impeller diameter

C. cube of the impeller diameter

D. impeller efficiency for large changes in the size of the impeller

63 Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?

A. Radiation

B. Conduction

C. Natural convection

D. All of the above

64 A gate valve installed in a pipeline should be_____.

A. used in either the fully closed or fully opened position

B. installed with the stem down

C. used for steam service only

D. used to throttle or regulate the flow of liquid

65 Over greasing of ball bearings installed on pumps will result in_____.

A. smoother pump operation

B. overheating of the bearing

C. reduced corrosion in the bearing

D. increased pump capacity

66 A spur gear pump should be operated with the discharge valves_____.

A. slightly opened

B. throttled

C. fully opened

D. halfway opened

67 The evaporating pressure in R22vapor compression refrigeration plant should be_____ atmospheric.

A. below

B. above

C. equal to

D. much larger than

68 A refrigerant boils and vaporizes in the_____ in a compression refrigeration system.

A. liquid receiver

B. compressor

C. condenser

D. cooling coil

69 A refrigerant gives up heat when it goes through_____.

A. condenser

B. regurgitate

C. evaporator

D. boil coil

70 In a compression refrigeration plant the refrigerant flows from the expansion valve and through the_____ where it absorbs heat from the space being cooled and becomes a gas or vapor.

A. compressor

B. condenser

C. throttle valve

D. evaporator

71 When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be_____.

A. dry

B. wet

C. super-cooled

D. superheated

72 In an oily water separator the oil will travel_____ to the oil collecting spaces.

A. upwards

B. downwards

C. outwards

D. forwards

73 When started, a complete oily water separating unit is first filled_____. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.

A. with dirty water

B. with clean water

C. by oily water

D. by mixed water

74 A high rate of separation between oil and water is favored by_____.

A. large size of oil globule

B. low temperature

C. high viscosity

D. high flow rate

75 The remaining oil/water mixture now flows down into the fine separating compartment and moves slowly between the_____ in the Turbulo separator.

A. catch plates

B. swash plates

C. cover plates

D. bedplates

76 The principle of separation by which all commercially available oily water separators function

is_____ differential between oil and water.

A. the temperature

B. the viscosity

C. the gravity

D. the size

77 The resistance to the movement of the globule in oily water mixture depends on its size and

the_____ of the fluid.

A. pressure

B. velocity

C. gravity

D. viscosity

78 _____ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from

a storage tank.

A. A filter

B. A centrifuge

C. A distiller

D. A generator

79 Factor influencing the position of the interface between the liquid seal and the oil in a purifier

is/are_____..

A. throughput

B. back pressure

C. gravity disc

D. None of the above is wrong.

80 In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to_____.

A. the outlet of oil

B. the outlet of water

C. the bowl periphery

D. the center of bowl

81 The cleaned heated oil, after passing through the centrifuges, is to be pumped to a_____.

A. settling tank

B. service tank

C. ballast tank

D. drain tank

82 The position of the interface between oil and water within the centrifuge is achieved by the use

of_____.

A. gravity disc

B. centrifugal bowl

C. a stack of discs

D. main sealing ring

83 To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting_____.

A. flashing water

B. operating oil

C. flushing water

D. sealing water

84 A high rate of separation between oil and water is favored by_____.

A. large size of oil globule

B. low temperature

C. high viscosity

D. high flow rate

85 Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl_____.

A. bottom

B. top

C. center

D. periphery

86 We use_____ to distill fresh water from sea water.

A. engine

B. sea water pump

C. cylinder cooler

D. fresh water generator

87 The designed capacity is 25tons a day, but the fresh water generator can only_____22tons at

present.

A. consume

B. distill

C. run

D. operate

88 In the process of_____, liquid changes into gas.

A. evaporation

B. frosting

C. condensing

D. compressing

89 More than one stage of evaporation can take place by admitting the sea water into chamber with progressively_____ pressure in the flash evaporator.

A. lower

B. higher

C. the lower

D. the higher

90 In a vacuum distillation system, the case is the higher the pressure,_____.

A. the saturation temperature is higher

B. the higher the saturation temperature

C. the higher is the saturation temperature

D. the saturation temperature is more high

91 Because of the reduced_____ in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.

A. pressure

B. temperature

C. density

D. volume

92 In_____, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.

A. a flash generator

B. a flash evaporator

C. a vacuum boiling evaporator

D. a boiler

93 The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as_____.

A. dehydration

B. condensation

C. evaporation

D. dissolution

94 Distilled water from an evaporator may be discharged into a potable water tank_____.

A. through a detachable hose connection

B. after passing through an activated charcoal filter

C. after chemical analysis shows it is fit for consumption

D. through a solenoid operated three-way valve

95 The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with_____.

A. a needle gun

B. soap and water

C. a wire brush

D. a chipping hammer

96 Brine density in a distilling plant is measured with a/an_____.

A. psychrometer

B. salinometer

C. anemometer

D. sphygmomanometer

97 A salinity indicating system functions on the basic principle of measuring the_____.

A. electrical inductance of water

B. electrical conductivity of water

C. specific gravity of water

D. hydrogen ion concentration of water

98 In a flash type evaporator, all saltwater headers are vented through individual vent cocks to

the_____.

A. saltwater heater shell

B. second-stage condenser

C. atmosphere

D. second-stage flash chamber

99 In a flash distilling unit, evaporator feed (seawater) first absorbs heat in the_____.

A. vapor feed heater

B. air ejector condenser

C. saltwater heater

D. distillate cooler

100 Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the_____.

A. first stage

B. second stage

C. distillate cooler

D. salt water feed heater

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